KR100732672B1 - Pcb of mobile communication device - Google Patents

Abstract

A PCB(Printed Circuit Board) of a mobile communication terminal is provided to obtain variability of short and feed pads even though positions of a feeding pin and a short pin of a planar invert F antenna are changed. A PCB of a mobile communication terminal includes a first pad(32), a second pad(34), a plurality of unit pads(36-1,36-2), at least one third pad(38), and a first stub. The plurality of unit pads(36-1,36-2) is formed on each serial path between the first pad(32) and a ground, and between the second pad(34) and the ground. The third pad(38) is installed on a signal line. The first stub is selectively connected between the third pad(38) and the unit pad(36-1,36-2) on the serial path between the first pad(32) and the ground among the plurality unit pads(36-1,36-2) or between the third pad(38) and the unit pad(36-1,36-2) on the serial path between the second pad(34) and the ground.

Description

Printed circuit board of mobile communication terminal {PCB of mobile communication device}

1 is a view showing an example of a printed circuit board for feeding and short-circuit to a flat station F antenna of a typical mobile communication terminal,

FIG. 2 is a view illustrating a stub connected to the printed circuit board of FIG. 1;

3 is a view showing a modified design of the printed circuit board of FIG.

4 is a view showing an example of a printed circuit board for power supply and short circuit to a flat station F antenna of a mobile communication terminal according to the present invention;

5a and 5b are views for explaining a form of connecting the stub to the printed circuit board of FIG.

6A and 6B are views illustrating a stub connected to the printed circuit board of FIG. 4, and

7A and 7B illustrate another example of a printed circuit board for feeding and shorting the planar inverted-F antenna of the mobile communication terminal according to the present invention.

Explanation of symbols on the main parts of the drawings

10, 20, 30, 50: printed circuit board 12, 22: feeding pad

14, 24: GND pad

16, 18, 26, 28, 36-1, 36-2, 56-1, 56-2: unit pad

32, 52: first pad 34, 54: second pad

38, 58: third pad 40-1, 40-2: stub

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board (PCB) of a mobile communication terminal. More particularly, the variability of a pad for feeding and shorting of a planar inverted F antenna of a mobile communication terminal is described. The present invention relates to a printed circuit board of a mobile communication terminal secured.

Recently, the mobile communication terminal is required to be miniaturized and light weight, and to perform various functions. In order to satisfy such demands, embedded circuits and components employed in mobile communication terminals are gradually miniaturizing while satisfying multifunctionality. In addition, the trend is similarly progressing in the antenna which is one of the main components of the mobile communication terminal.

Antennas of mobile communication terminals are largely divided into external type and internal type. The external antenna is installed to protrude outside the mobile communication terminal, and has a monopole or a helical structure fixedly installed outside the mobile communication terminal. However, such an external antenna has a problem in that a shape protruding to the outside may obscure the appearance of the mobile communication terminal and occupy a large volume of the entire mobile communication terminal. In addition, since the external antenna is placed close to the human body in the call mode, there is a problem that the amount of electromagnetic waves that enter the human body increases.

It is a built-in antenna that was developed to solve the above problems. There are many kinds of built-in antennas depending on the type of mobile communication terminal (bar type, flip type, folder type, slide type, etc. Among them, the planar inverted F antenna (PIFA) Inverted-F Antenna) is the dominant structure.

In the case of a typical PIFA antenna, an antenna radiator is made of a highly elastic stainless metal on a plastic injection molding called a base or a carrier, and then contacted with an antenna terminal of a printed circuit board (PCB) to realize characteristics.

The frequency and radiation characteristics of the antenna are determined by the shape of the antenna radiator and the volume of the antenna. For this reason, the shape of the radiator is complicated and diverse. In addition, the way that the PIFA antenna is in contact with the PCB is not a method of mechanical coupling such as soldering, but rather a plastic injection molding supporting the radiator to the PCB by hooking or screwing the PCB to the feed part and the short of the antenna. The additional PCB is coupled by pressing it into contact with the signal line and ground of the PCB.

1 is a diagram schematically showing an example of a printed circuit board for feeding and shorting to a planar station F antenna of a general mobile communication terminal. In the drawing, the pad of the signal line for feeding is indicated by a feeding pad 12, and the pad of the ground line for shorting is represented by a ground (GND) pad 14.

Referring to the drawings, the printed circuit board 10 of the mobile communication terminal has a feed pad 12 for feeding a flat inverted F antenna (not shown), and a ground pad 14 for shorting. At this time, a plurality of unit pads 18 for connecting the stub 16 is provided on the feed pad 12 side.

In general, a stub is used for impedance matching in a circuit composed of microstrips or strip lines, and is used for signal transmission for frequency tuning or broadband characteristics, not for signal transmission purposes. It refers to a circuit portion additionally connected to the line for. Such a stub is a parallel stub 16-1 connected in a vertical direction to a line for signal transmission and a series stub 16-2 connected in a horizontal direction to the line as shown in FIG. ). FIG. 2 shows a pie printed circuit board 10 in which parallel stubs 16-1 and serial stubs 16-2 are connected in a pi form.

In general, the planar inverted-F antenna has a sensitive effect on the passband (BW), reflection coefficient (VSWR), gain, etc. of the antenna depending on the position and spacing of the feed pin and the short pin. However, since the positions of the feed pad and the ground pad of the PCB according to the related art are fixed, the positions of the feed pin and the short pin of the planar inverted-F antenna are changed so that the pass band (BW) and the reflection coefficient (VSWR) are fixed. ), There is a problem in that a new printed circuit board must be manufactured in order to adjust gain. In particular, when the positions of the feed pins and the shorting pins of the planar inverted-F antenna are interchanged with each other, in the conventional printed circuit board as shown in FIG. 1, the feeding and the shorting are impossible at the positions of the changed feed pins and the shorting pins. As shown in FIG. 3, there is a problem in that a printed circuit board 20 having a plurality of unit pads 28 for connecting the feed pad 22, the ground pad 24, and the stub 26 must be newly manufactured.

The present invention has been made to solve the above problems, the printed circuit board of the mobile communication terminal that ensures the variability of the pad for feeding and short-circuit even when the position of the feeding pin and the shorting pin of the flat inverted F antenna The purpose is to provide.

A printed circuit board of a mobile communication terminal according to the present invention for achieving the above object, the printed circuit board of the mobile communication terminal for feeding and short-circuit of the flat inverted F antenna, the first pad; A second pad; A plurality of unit pads formed on respective series path lines between the first pad and the ground and between the second pad and the ground; At least one third pad formed on the signal line; And a unit pad and a third pad on a serial path line between the first pad and the ground, between the unit pad and the third pad, or between the second pad and the ground. It characterized in that it comprises a first stub selectively connected between.

Here, the printed circuit board of the mobile communication terminal further comprises a second stub connected between at least two unit pads of the unit pads on the serial path line between the first pad and the round to form the serial path. It is preferable to include.

The printed circuit board of the mobile communication terminal may further include a second stub connected between at least two unit pads of the unit pads on the serial path line between the second pad and the ground to form the serial path. It is desirable to.

Preferably, the third pad is provided in plurality, and the first stub is connected between the third pad and the unit pad on the series path line between the first pad and the ground.

Alternatively, the third pad may be provided in plurality, and the first stub may be connected between the third pad and the unit pad on the serial path line between the second pad and the ground.

At this time, the first stub and the second stub is preferably connected in a pi (π) type.

In addition, it is preferable that the first stub and the second stub formed in a pie form constitute one circuit stage for impedance matching, and the circuit stage is formed in plural.

As a result, even when the positions of the feeding pin and the shorting pin of the planar inverted-F antenna are changed, it is possible to simply change the positions of the pads for feeding and short-circuit, without having to manufacture a printed circuit board of the mobile communication terminal.

Hereinafter, a printed circuit board of a mobile communication terminal according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram schematically showing an example of a printed circuit board for power supply and short circuit to a planar inverted F antenna of a mobile communication terminal according to the present invention. Referring to the drawings, the printed circuit board 30 of the mobile communication terminal includes a first pad 32, a second pad 34, and a space between the first pad 32 and the ground and between the second pad 34 and the ground. And a plurality of unit pads 36-1 and 39-2 formed on each series path line of the at least one third pad 38, and at least one third pad 38 formed on the signal line.

Here, among the plurality of unit pads 36-1 and 36-2, between the unit pads 36-1 and the third pad 38 on the series path line between the first pad 32 and the ground, and 1 A stub may be connected between at least two unit pads of the unit pads 36-1 on the serial path line between the pad 32 and the ground, as shown by the dotted line 39-1 of FIG. 5A. have. In this case, between the unit pads 36-1 for connecting with the stub, the circuit is not connected to the printed circuit board 30 itself but is electrically connected by the stub connection. At this time, for selective connection of the stub, the portion 39-2, which is indicated by a dotted line, between at least two unit pads of the unit pads 36-2 on the series path line between the second pad 34 and the ground. As such, the circuit is not connected to the printed circuit board 30 itself, and is formed to be electrically connected by the connection of the stub. In addition, a circuit is not connected to the printed circuit board 30 itself between the plurality of unit pads 36-1 and 36-2 and the third pads on the signal line line, and is electrically connected by the stub. Connected. In addition, a circuit is designed to be connected to the printed circuit board 30 itself between the third pads 38. The same applies to the following.

Alternatively, among the plurality of unit pads 36-1 and 36-2, between the unit pads 36-2 and the third pad 38 on the series path line between the second pad 32 and the ground, and A stub may be connected between at least two of the unit pads 36-2 on the serial path line between the 2 pads 32 and the ground, as shown by the dotted line 39-2 of FIG. 5B. have. In this case, between the unit pads 36-2 for connecting with the stub, the circuit is not connected to the printed circuit board 30 itself but is electrically connected by the stub connection. At this time, for selective connection of the stub, the portion 39-1 of the unit pads 36-1 of the unit pads 36-1 on the serial path line between the first pad 32 and the ground is indicated by a dotted line 39-1. As such, the circuit is not connected to the printed circuit board 30 itself, and is formed to be electrically connected by the connection of the stub.

FIG. 6A shows a printed circuit board 30 for using the first pad 32 as a power feeding pad. The stubs 40-1 and 40-2 are provided on the respective unit pads 36-1 and 36-2. Shows the connected shape. Here, the stub 40-1 connected to the uppermost unit pad and the uppermost third pad 38 among the unit pads 36-1 constitutes a series circuit on the signal line line. In addition, the stub 40-1 connected to the bottom unit pad and the bottom third pad 38 of the unit pads 36-1, and on the serial path line between the first pad 32 and the ground. The stubs 40-1 connected between the unit pads 36-1 which are present form a parallel circuit with respect to the stub 40-1 connected to the top. At this time, each stub (40-1) is preferably connected in a pi (π) type. In addition, the stub 40-2 connected between the unit pads 36-2 on the series path line between the second pad 34 and the ground is not connected to the second pad 34 by the stub 40-2. It serves to connect 34 to ground.

FIG. 6B shows a printed circuit board 30 for using the second pad 34 as a power feeding pad. The stubs 40-1 and 40-2 are attached to the respective unit pads 36-1 and 36-2. Shows the connected shape. Here, the stub 40-2 connected to the uppermost unit pad and the uppermost third pad 38 among the unit pads 36-2 constitutes a series circuit on the signal line line. In addition, the stub 40-2 connected to the lowest unit pad and the lowest third pad 38 of the unit pads 36-2, and on the serial path line between the second pad 34 and the ground. The stubs 40-2 connected between the unit pads 36-2 are configured to form parallel circuits with respect to the stub 40-2 connected to the top. At this time, each stub 40-2 is preferably connected in a pi (π) type. In addition, the stub 40-1 connected between the unit pads 36-1 on the series path line between the first pad 32 and the ground is not connected to the second pad until the stub 40-1 is connected. It serves to connect 34 to ground.

Herein, in order to secure the variability of the pads as described above, the printed circuit board 30 includes two of the unit pads 36-1 between the first pad 32 and the ground, starting from the uppermost unit pad. It is preferably designed to be electrically connected, and is preferably designed to be electrically insulated between pairs of electrically connected unit pads. In addition, among the unit pads 36-2 between the second pad 34 and the ground, two of the unit pads are designed to be electrically connected, starting from the uppermost unit pad, and electrically insulated between the pair of unit pads. It is preferably designed to be. In this case, the uppermost unit pads of the plurality of unit pads 36-1 and 36-2 may be electrically connected to the first pad 32 and the second pad 34, respectively.

7A and 7B illustrate another example of a printed circuit board for feeding and shorting a plane inverted-F antenna of a mobile communication terminal according to the present invention.

Referring to FIG. 7A, the unit pads 56-1 between the first pad 52 and the ground are electrically connected to two uppermost unit pads, and three unit pads below each other are connected to each other. It is electrically connected. In addition, the uppermost unit pads of the unit pads 56-2 between the second pad 54 and the ground are electrically connected to each other, and the three unit pads below are electrically connected to each other. have.

At this time, the third pads 58 on the signal line line are electrically connected to each other from the top, and the bottom two are electrically connected to each other.

In this configuration, as shown in FIG. 7B, of the unit pads and the third pads on the same line, the unit pads and the third pads that are electrically insulated from each other are the stub 59-1 and the stub 59. Connected by -2). In addition, the unit pads 56-1 on the line of the first pad 52 and the third pads 58 on the signal line are connected with a stub or the unit pads on the line of the second pad 54. By connecting the pads 56-2 and the third pads 58 in the signal line, the first pad 52 or the second pad 54 can be selectively used as a feeding pad. At this time, the pie-shaped circuit stages are implemented in plural in a shape in which directions cross each other.

In the drawing, the distance between the unit pads 36-1 and 56-1 and the third pads 38 and 58 and the unit pads 36-2 and 56-2 and the third pads 38 and 58 are shown. Although the distance between the pins has a slight difference, in order to change the position of the feeding pad according to the position of the stub implemented in the form of a chip, the unit pads 36-1 and 56-1 and the third pads are used. The interval between the 38 and 58 and the interval between the unit pads 36-2 and 56-2 and the third pads 38 and 58 are preferably formed at the same interval.

In addition, although the stubs are shown to form one pi (π) type, the present invention is not limited thereto, and the circuit terminals formed by the stubs may constitute a plurality of pi (π) type circuit terminals.

In addition, in the above, it has been described that the pi-type circuit stage is formed by the stubs, but the circuit stage formed by the stubs is not limited to the pi-type, and may be configured as various modified circuit stages.

As a result, the printed circuit board of the mobile communication terminal according to the present invention can easily supply and short-circuit the circuit board of the mobile communication terminal without requiring a new printed circuit board even when the positions of the feed pin and the short-circuit pin of the flat inverted-F antenna are changed. It is possible to change the position of the pad.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not limited to the specific embodiments of the present invention without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

According to the present invention, even when the feeding and shorting positions of the planar inverted F antenna are interchanged with each other, the position of the pads for feeding and shorting can be easily changed by only changing the position of the stub without having to newly manufacture the printed circuit board of the mobile communication terminal. You can change it.

Claims (7)

A printed circuit board of a mobile communication terminal for feeding and shorting a plane inverse F antenna, A first pad; A second pad; A plurality of unit pads formed on respective series path lines between the first pad and the ground and between the second pad and the ground; At least one third pad formed on the signal line; And Among the plurality of unit pads, between the unit pad and the third pad on the series path line between the first pad and the ground, or between the unit pad and the third pad on the series path line between the second pad and the ground. Printed circuit board of a mobile communication terminal comprising a first stub selectively connected to. The method of claim 1, The printed circuit board of the mobile communication terminal further comprises a second stub connected between at least two unit pads of the unit pads on the serial path line between the first pad and the ground to form the serial path. . The method of claim 1, The printed circuit board of the mobile communication terminal further comprises a second stub connected between at least two unit pads on the serial path line between the second pad and the ground to form the serial path. . The method of claim 2, The third pad is provided in plurality, And the first stub is connected between the unit pad and the third pad on a serial path line between the first pad and the ground, respectively. The method of claim 3, wherein The third pad is provided in plurality, And the first stub is connected between the unit pad and the third pad on a serial path line between the second pad and the ground, respectively. The method according to claim 4 or 5, The first stub and the second stub is a printed circuit board of the mobile communication terminal, characterized in that connected in a pi (π) type. The method of claim 6, The first stub and the second stub formed in a pie shape constitute a circuit stage for impedance matching, The printed circuit board of the mobile communication terminal, characterized in that formed in plurality.

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